671 lines
20 KiB
C++
671 lines
20 KiB
C++
/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Garret Rieger, Rod Sheeter, Behdad Esfahbod
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*/
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#include "hb-subset.hh"
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#include "hb-set.hh"
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#include "hb-utf.hh"
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hb_subset_input_t::hb_subset_input_t ()
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{
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for (auto& set : sets_iter ())
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set = hb::shared_ptr<hb_set_t> (hb_set_create ());
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if (in_error ())
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return;
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flags = HB_SUBSET_FLAGS_DEFAULT;
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hb_set_add_range (sets.name_ids, 0, 6);
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hb_set_add (sets.name_languages, 0x0409);
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hb_tag_t default_drop_tables[] = {
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// Layout disabled by default
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HB_TAG ('m', 'o', 'r', 'x'),
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HB_TAG ('m', 'o', 'r', 't'),
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HB_TAG ('k', 'e', 'r', 'x'),
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HB_TAG ('k', 'e', 'r', 'n'),
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// Copied from fontTools:
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HB_TAG ('B', 'A', 'S', 'E'),
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HB_TAG ('J', 'S', 'T', 'F'),
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HB_TAG ('D', 'S', 'I', 'G'),
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HB_TAG ('E', 'B', 'D', 'T'),
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HB_TAG ('E', 'B', 'L', 'C'),
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HB_TAG ('E', 'B', 'S', 'C'),
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HB_TAG ('S', 'V', 'G', ' '),
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HB_TAG ('P', 'C', 'L', 'T'),
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HB_TAG ('L', 'T', 'S', 'H'),
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// Graphite tables
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HB_TAG ('F', 'e', 'a', 't'),
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HB_TAG ('G', 'l', 'a', 't'),
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HB_TAG ('G', 'l', 'o', 'c'),
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HB_TAG ('S', 'i', 'l', 'f'),
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HB_TAG ('S', 'i', 'l', 'l'),
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};
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sets.drop_tables->add_array (default_drop_tables, ARRAY_LENGTH (default_drop_tables));
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hb_tag_t default_no_subset_tables[] = {
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HB_TAG ('g', 'a', 's', 'p'),
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HB_TAG ('f', 'p', 'g', 'm'),
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HB_TAG ('p', 'r', 'e', 'p'),
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HB_TAG ('V', 'D', 'M', 'X'),
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HB_TAG ('D', 'S', 'I', 'G'),
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};
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sets.no_subset_tables->add_array (default_no_subset_tables,
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ARRAY_LENGTH (default_no_subset_tables));
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//copied from _layout_features_groups in fonttools
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hb_tag_t default_layout_features[] = {
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// default shaper
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// common
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HB_TAG ('r', 'v', 'r', 'n'),
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HB_TAG ('c', 'c', 'm', 'p'),
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HB_TAG ('l', 'i', 'g', 'a'),
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HB_TAG ('l', 'o', 'c', 'l'),
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HB_TAG ('m', 'a', 'r', 'k'),
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HB_TAG ('m', 'k', 'm', 'k'),
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HB_TAG ('r', 'l', 'i', 'g'),
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//fractions
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HB_TAG ('f', 'r', 'a', 'c'),
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HB_TAG ('n', 'u', 'm', 'r'),
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HB_TAG ('d', 'n', 'o', 'm'),
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//horizontal
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HB_TAG ('c', 'a', 'l', 't'),
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HB_TAG ('c', 'l', 'i', 'g'),
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HB_TAG ('c', 'u', 'r', 's'),
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HB_TAG ('k', 'e', 'r', 'n'),
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HB_TAG ('r', 'c', 'l', 't'),
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//vertical
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HB_TAG ('v', 'a', 'l', 't'),
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HB_TAG ('v', 'e', 'r', 't'),
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HB_TAG ('v', 'k', 'r', 'n'),
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HB_TAG ('v', 'p', 'a', 'l'),
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HB_TAG ('v', 'r', 't', '2'),
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//ltr
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HB_TAG ('l', 't', 'r', 'a'),
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HB_TAG ('l', 't', 'r', 'm'),
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//rtl
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HB_TAG ('r', 't', 'l', 'a'),
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HB_TAG ('r', 't', 'l', 'm'),
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//random
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HB_TAG ('r', 'a', 'n', 'd'),
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//justify
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HB_TAG ('j', 'a', 'l', 't'), // HarfBuzz doesn't use; others might
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//private
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HB_TAG ('H', 'a', 'r', 'f'),
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HB_TAG ('H', 'A', 'R', 'F'),
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HB_TAG ('B', 'u', 'z', 'z'),
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HB_TAG ('B', 'U', 'Z', 'Z'),
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//shapers
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//arabic
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HB_TAG ('i', 'n', 'i', 't'),
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HB_TAG ('m', 'e', 'd', 'i'),
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HB_TAG ('f', 'i', 'n', 'a'),
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HB_TAG ('i', 's', 'o', 'l'),
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HB_TAG ('m', 'e', 'd', '2'),
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HB_TAG ('f', 'i', 'n', '2'),
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HB_TAG ('f', 'i', 'n', '3'),
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HB_TAG ('c', 's', 'w', 'h'),
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HB_TAG ('m', 's', 'e', 't'),
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HB_TAG ('s', 't', 'c', 'h'),
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//hangul
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HB_TAG ('l', 'j', 'm', 'o'),
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HB_TAG ('v', 'j', 'm', 'o'),
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HB_TAG ('t', 'j', 'm', 'o'),
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//tibetan
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HB_TAG ('a', 'b', 'v', 's'),
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HB_TAG ('b', 'l', 'w', 's'),
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HB_TAG ('a', 'b', 'v', 'm'),
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HB_TAG ('b', 'l', 'w', 'm'),
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//indic
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HB_TAG ('n', 'u', 'k', 't'),
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HB_TAG ('a', 'k', 'h', 'n'),
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HB_TAG ('r', 'p', 'h', 'f'),
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HB_TAG ('r', 'k', 'r', 'f'),
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HB_TAG ('p', 'r', 'e', 'f'),
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HB_TAG ('b', 'l', 'w', 'f'),
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HB_TAG ('h', 'a', 'l', 'f'),
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HB_TAG ('a', 'b', 'v', 'f'),
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HB_TAG ('p', 's', 't', 'f'),
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HB_TAG ('c', 'f', 'a', 'r'),
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HB_TAG ('v', 'a', 't', 'u'),
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HB_TAG ('c', 'j', 'c', 't'),
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HB_TAG ('i', 'n', 'i', 't'),
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HB_TAG ('p', 'r', 'e', 's'),
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HB_TAG ('a', 'b', 'v', 's'),
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HB_TAG ('b', 'l', 'w', 's'),
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HB_TAG ('p', 's', 't', 's'),
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HB_TAG ('h', 'a', 'l', 'n'),
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HB_TAG ('d', 'i', 's', 't'),
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HB_TAG ('a', 'b', 'v', 'm'),
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HB_TAG ('b', 'l', 'w', 'm'),
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};
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sets.layout_features->add_array (default_layout_features, ARRAY_LENGTH (default_layout_features));
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sets.layout_scripts->invert (); // Default to all scripts.
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}
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/**
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* hb_subset_input_create_or_fail:
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*
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* Creates a new subset input object.
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*
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* Return value: (transfer full): New subset input, or `NULL` if failed. Destroy
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* with hb_subset_input_destroy().
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*
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* Since: 1.8.0
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**/
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hb_subset_input_t *
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hb_subset_input_create_or_fail (void)
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{
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hb_subset_input_t *input = hb_object_create<hb_subset_input_t>();
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if (unlikely (!input))
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return nullptr;
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if (input->in_error ())
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{
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hb_subset_input_destroy (input);
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return nullptr;
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}
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return input;
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}
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/**
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* hb_subset_input_reference: (skip)
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* @input: a #hb_subset_input_t object.
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*
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* Increases the reference count on @input.
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*
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* Return value: @input.
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*
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* Since: 1.8.0
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**/
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hb_subset_input_t *
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hb_subset_input_reference (hb_subset_input_t *input)
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{
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return hb_object_reference (input);
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}
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/**
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* hb_subset_input_destroy:
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* @input: a #hb_subset_input_t object.
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*
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* Decreases the reference count on @input, and if it reaches zero, destroys
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* @input, freeing all memory.
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*
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* Since: 1.8.0
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**/
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void
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hb_subset_input_destroy (hb_subset_input_t *input)
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{
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if (!hb_object_destroy (input)) return;
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hb_free (input);
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}
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/**
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* hb_subset_input_unicode_set:
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* @input: a #hb_subset_input_t object.
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*
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* Gets the set of Unicode code points to retain, the caller should modify the
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* set as needed.
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*
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* Return value: (transfer none): pointer to the #hb_set_t of Unicode code
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* points.
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*
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* Since: 1.8.0
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**/
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HB_EXTERN hb_set_t *
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hb_subset_input_unicode_set (hb_subset_input_t *input)
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{
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return input->sets.unicodes;
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}
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/**
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* hb_subset_input_glyph_set:
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* @input: a #hb_subset_input_t object.
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*
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* Gets the set of glyph IDs to retain, the caller should modify the set as
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* needed.
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*
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* Return value: (transfer none): pointer to the #hb_set_t of glyph IDs.
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*
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* Since: 1.8.0
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**/
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HB_EXTERN hb_set_t *
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hb_subset_input_glyph_set (hb_subset_input_t *input)
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{
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return input->sets.glyphs;
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}
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/**
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* hb_subset_input_set:
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* @input: a #hb_subset_input_t object.
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* @set_type: a #hb_subset_sets_t set type.
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*
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* Gets the set of the specified type.
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*
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* Return value: (transfer none): pointer to the #hb_set_t of the specified type.
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*
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* Since: 2.9.1
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**/
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HB_EXTERN hb_set_t *
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hb_subset_input_set (hb_subset_input_t *input, hb_subset_sets_t set_type)
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{
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return input->sets_iter () [set_type];
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}
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/**
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* hb_subset_input_get_flags:
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* @input: a #hb_subset_input_t object.
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*
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* Gets all of the subsetting flags in the input object.
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*
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* Return value: the subsetting flags bit field.
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*
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* Since: 2.9.0
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**/
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HB_EXTERN hb_subset_flags_t
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hb_subset_input_get_flags (hb_subset_input_t *input)
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{
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return (hb_subset_flags_t) input->flags;
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}
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/**
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* hb_subset_input_set_flags:
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* @input: a #hb_subset_input_t object.
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* @value: bit field of flags
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*
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* Sets all of the flags in the input object to the values specified by the bit
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* field.
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*
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* Since: 2.9.0
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**/
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HB_EXTERN void
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hb_subset_input_set_flags (hb_subset_input_t *input,
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unsigned value)
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{
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input->flags = (hb_subset_flags_t) value;
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}
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/**
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* hb_subset_input_set_user_data: (skip)
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* @input: a #hb_subset_input_t object.
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* @key: The user-data key to set
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* @data: A pointer to the user data
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* @destroy: (nullable): A callback to call when @data is not needed anymore
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* @replace: Whether to replace an existing data with the same key
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*
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* Attaches a user-data key/data pair to the given subset input object.
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*
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* Return value: `true` if success, `false` otherwise
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*
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* Since: 2.9.0
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**/
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hb_bool_t
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hb_subset_input_set_user_data (hb_subset_input_t *input,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace)
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{
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return hb_object_set_user_data (input, key, data, destroy, replace);
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}
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/**
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* hb_subset_input_get_user_data: (skip)
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* @input: a #hb_subset_input_t object.
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* @key: The user-data key to query
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*
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* Fetches the user data associated with the specified key,
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* attached to the specified subset input object.
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*
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* Return value: (transfer none): A pointer to the user data
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*
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* Since: 2.9.0
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**/
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void *
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hb_subset_input_get_user_data (const hb_subset_input_t *input,
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hb_user_data_key_t *key)
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{
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return hb_object_get_user_data (input, key);
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}
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/**
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* hb_subset_input_keep_everything:
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* @input: a #hb_subset_input_t object
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*
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* Configure input object to keep everything in the font face.
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* That is, all Unicodes, glyphs, names, layout items,
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* glyph names, etc.
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*
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* The input can be tailored afterwards by the caller.
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*
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* Since: 7.0.0
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*/
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void
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hb_subset_input_keep_everything (hb_subset_input_t *input)
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{
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const hb_subset_sets_t indices[] = {HB_SUBSET_SETS_UNICODE,
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HB_SUBSET_SETS_GLYPH_INDEX,
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HB_SUBSET_SETS_NAME_ID,
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HB_SUBSET_SETS_NAME_LANG_ID,
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HB_SUBSET_SETS_LAYOUT_FEATURE_TAG,
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HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG};
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for (auto idx : hb_iter (indices))
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{
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hb_set_t *set = hb_subset_input_set (input, idx);
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hb_set_clear (set);
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hb_set_invert (set);
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}
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// Don't drop any tables
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hb_set_clear (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG));
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hb_subset_input_set_flags (input,
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HB_SUBSET_FLAGS_NOTDEF_OUTLINE |
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HB_SUBSET_FLAGS_GLYPH_NAMES |
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HB_SUBSET_FLAGS_NO_PRUNE_UNICODE_RANGES |
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HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED);
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}
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#ifndef HB_NO_VAR
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/**
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* hb_subset_input_pin_axis_to_default: (skip)
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* @input: a #hb_subset_input_t object.
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* @face: a #hb_face_t object.
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* @axis_tag: Tag of the axis to be pinned
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*
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* Pin an axis to its default location in the given subset input object.
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*
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* All axes in a font must be pinned. Additionally, `CFF2` table, if present,
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* will be de-subroutinized.
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*
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* Return value: `true` if success, `false` otherwise
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*
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* Since: 6.0.0
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**/
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HB_EXTERN hb_bool_t
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hb_subset_input_pin_axis_to_default (hb_subset_input_t *input,
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hb_face_t *face,
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hb_tag_t axis_tag)
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{
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hb_ot_var_axis_info_t axis_info;
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if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
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return false;
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float default_val = axis_info.default_value;
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return input->axes_location.set (axis_tag, Triple (default_val, default_val, default_val));
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}
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/**
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* hb_subset_input_pin_axis_location: (skip)
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* @input: a #hb_subset_input_t object.
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* @face: a #hb_face_t object.
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* @axis_tag: Tag of the axis to be pinned
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* @axis_value: Location on the axis to be pinned at
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*
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* Pin an axis to a fixed location in the given subset input object.
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*
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* All axes in a font must be pinned. Additionally, `CFF2` table, if present,
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* will be de-subroutinized.
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*
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* Return value: `true` if success, `false` otherwise
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*
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* Since: 6.0.0
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**/
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HB_EXTERN hb_bool_t
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hb_subset_input_pin_axis_location (hb_subset_input_t *input,
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hb_face_t *face,
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hb_tag_t axis_tag,
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float axis_value)
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{
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hb_ot_var_axis_info_t axis_info;
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if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
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return false;
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float val = hb_clamp(axis_value, axis_info.min_value, axis_info.max_value);
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return input->axes_location.set (axis_tag, Triple (val, val, val));
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}
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#ifdef HB_EXPERIMENTAL_API
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/**
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* hb_subset_input_set_axis_range: (skip)
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* @input: a #hb_subset_input_t object.
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* @face: a #hb_face_t object.
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* @axis_tag: Tag of the axis
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* @axis_min_value: Minimum value of the axis variation range to set
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* @axis_max_value: Maximum value of the axis variation range to set
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* @axis_def_value: Default value of the axis variation range to set, in case of
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|
* null, it'll be determined automatically
|
|
*
|
|
* Restricting the range of variation on an axis in the given subset input object.
|
|
* New min/default/max values will be clamped if they're not within the fvar axis range.
|
|
* If the new default value is null:
|
|
* If the fvar axis default value is within the new range, then new default
|
|
* value is the same as original default value.
|
|
* If the fvar axis default value is not within the new range, the new default
|
|
* value will be changed to the new min or max value, whichever is closer to the fvar
|
|
* axis default.
|
|
*
|
|
* Note: input min value can not be bigger than input max value. If the input
|
|
* default value is not within the new min/max range, it'll be clamped.
|
|
* Note: currently it supports gvar and cvar tables only.
|
|
*
|
|
* Return value: `true` if success, `false` otherwise
|
|
*
|
|
* XSince: EXPERIMENTAL
|
|
**/
|
|
HB_EXTERN hb_bool_t
|
|
hb_subset_input_set_axis_range (hb_subset_input_t *input,
|
|
hb_face_t *face,
|
|
hb_tag_t axis_tag,
|
|
float axis_min_value,
|
|
float axis_max_value,
|
|
float *axis_def_value /* IN, maybe NULL */)
|
|
{
|
|
if (axis_min_value > axis_max_value)
|
|
return false;
|
|
|
|
hb_ot_var_axis_info_t axis_info;
|
|
if (!hb_ot_var_find_axis_info (face, axis_tag, &axis_info))
|
|
return false;
|
|
|
|
float new_min_val = hb_clamp(axis_min_value, axis_info.min_value, axis_info.max_value);
|
|
float new_max_val = hb_clamp(axis_max_value, axis_info.min_value, axis_info.max_value);
|
|
float new_default_val = axis_def_value ? *axis_def_value : axis_info.default_value;
|
|
new_default_val = hb_clamp(new_default_val, new_min_val, new_max_val);
|
|
return input->axes_location.set (axis_tag, Triple (new_min_val, new_default_val, new_max_val));
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
/**
|
|
* hb_subset_preprocess:
|
|
* @source: a #hb_face_t object.
|
|
*
|
|
* Preprocesses the face and attaches data that will be needed by the
|
|
* subsetter. Future subsetting operations can then use the precomputed data
|
|
* to speed up the subsetting operation.
|
|
*
|
|
* See [subset-preprocessing](https://github.com/harfbuzz/harfbuzz/blob/main/docs/subset-preprocessing.md)
|
|
* for more information.
|
|
*
|
|
* Note: the preprocessed face may contain sub-blobs that reference the memory
|
|
* backing the source #hb_face_t. Therefore in the case that this memory is not
|
|
* owned by the source face you will need to ensure that memory lives
|
|
* as long as the returned #hb_face_t.
|
|
*
|
|
* Returns: a new #hb_face_t.
|
|
*
|
|
* Since: 6.0.0
|
|
**/
|
|
|
|
HB_EXTERN hb_face_t *
|
|
hb_subset_preprocess (hb_face_t *source)
|
|
{
|
|
hb_subset_input_t* input = hb_subset_input_create_or_fail ();
|
|
if (!input)
|
|
return hb_face_reference (source);
|
|
|
|
hb_subset_input_keep_everything (input);
|
|
|
|
input->attach_accelerator_data = true;
|
|
|
|
// Always use long loca in the preprocessed version. This allows
|
|
// us to store the glyph bytes unpadded which allows the future subset
|
|
// operation to run faster by skipping the trim padding step.
|
|
input->force_long_loca = true;
|
|
|
|
hb_face_t* new_source = hb_subset_or_fail (source, input);
|
|
hb_subset_input_destroy (input);
|
|
|
|
if (!new_source) {
|
|
DEBUG_MSG (SUBSET, nullptr, "Preprocessing failed due to subset failure.");
|
|
return hb_face_reference (source);
|
|
}
|
|
|
|
return new_source;
|
|
}
|
|
|
|
/**
|
|
* hb_subset_input_old_to_new_glyph_mapping:
|
|
* @input: a #hb_subset_input_t object.
|
|
*
|
|
* Returns a map which can be used to provide an explicit mapping from old to new glyph
|
|
* id's in the produced subset. The caller should populate the map as desired.
|
|
* If this map is left empty then glyph ids will be automatically mapped to new
|
|
* values by the subsetter. If populated, the mapping must be unique. That
|
|
* is no two original glyph ids can be mapped to the same new id.
|
|
* Additionally, if a mapping is provided then the retain gids option cannot
|
|
* be enabled.
|
|
*
|
|
* Any glyphs that are retained in the subset which are not specified
|
|
* in this mapping will be assigned glyph ids after the highest glyph
|
|
* id in the mapping.
|
|
*
|
|
* Note: this will accept and apply non-monotonic mappings, however this
|
|
* may result in unsorted Coverage tables. Such fonts may not work for all
|
|
* use cases (for example ots will reject unsorted coverage tables). So it's
|
|
* recommended, if possible, to supply a monotonic mapping.
|
|
*
|
|
* Return value: (transfer none): pointer to the #hb_map_t of the custom glyphs ID map.
|
|
*
|
|
* Since: 7.3.0
|
|
**/
|
|
HB_EXTERN hb_map_t*
|
|
hb_subset_input_old_to_new_glyph_mapping (hb_subset_input_t *input)
|
|
{
|
|
return &input->glyph_map;
|
|
}
|
|
|
|
#ifdef HB_EXPERIMENTAL_API
|
|
/**
|
|
* hb_subset_input_override_name_table:
|
|
* @input: a #hb_subset_input_t object.
|
|
* @name_id: name_id of a nameRecord
|
|
* @platform_id: platform ID of a nameRecord
|
|
* @encoding_id: encoding ID of a nameRecord
|
|
* @language_id: language ID of a nameRecord
|
|
* @name_str: pointer to name string new value or null to indicate should remove
|
|
* @str_len: the size of @name_str, or -1 if it is `NULL`-terminated
|
|
*
|
|
* Override the name string of the NameRecord identified by name_id,
|
|
* platform_id, encoding_id and language_id. If a record with that name_id
|
|
* doesn't exist, create it and insert to the name table.
|
|
*
|
|
* Note: for mac platform, we only support name_str with all ascii characters,
|
|
* name_str with non-ascii characters will be ignored.
|
|
*
|
|
* XSince: EXPERIMENTAL
|
|
**/
|
|
HB_EXTERN hb_bool_t
|
|
hb_subset_input_override_name_table (hb_subset_input_t *input,
|
|
hb_ot_name_id_t name_id,
|
|
unsigned platform_id,
|
|
unsigned encoding_id,
|
|
unsigned language_id,
|
|
const char *name_str,
|
|
int str_len /* -1 means nul-terminated */)
|
|
{
|
|
if (!name_str)
|
|
{
|
|
str_len = 0;
|
|
}
|
|
else if (str_len == -1)
|
|
{
|
|
str_len = strlen (name_str);
|
|
}
|
|
|
|
hb_bytes_t name_bytes (nullptr, 0);
|
|
if (str_len)
|
|
{
|
|
if (platform_id == 1)
|
|
{
|
|
const uint8_t *src = reinterpret_cast<const uint8_t*> (name_str);
|
|
const uint8_t *src_end = src + str_len;
|
|
|
|
hb_codepoint_t unicode;
|
|
const hb_codepoint_t replacement = HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT;
|
|
while (src < src_end)
|
|
{
|
|
src = hb_utf8_t::next (src, src_end, &unicode, replacement);
|
|
if (unicode >= 0x0080u)
|
|
{
|
|
printf ("Non-ascii character detected, ignored...This API supports acsii characters only for mac platform\n");
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
char *override_name = (char *) hb_malloc (str_len);
|
|
if (unlikely (!override_name)) return false;
|
|
|
|
hb_memcpy (override_name, name_str, str_len);
|
|
name_bytes = hb_bytes_t (override_name, str_len);
|
|
}
|
|
input->name_table_overrides.set (hb_ot_name_record_ids_t (platform_id, encoding_id, language_id, name_id), name_bytes);
|
|
return true;
|
|
}
|
|
|
|
#endif
|